Hitachi has been developing amine-based post-combustion CO_2 capture technologies to control CO_2 emissions from coal-fired power plants. Through early bench-scale and pilot-scale tests that started over 20 years ago, different formulations of amines and additives were evaluated to identify solvents with a high CO_2 absorption capacity, low regeneration energy requirement and long service life. Multiple solvent blends along with commercial MEA were tested at Hitachi's first CO_2 capture slipstream pilot plant built at Yokosuka Thermal Power Plant in cooperation with Tokyo Electric Power Company in Japan. The best solvent, H3, showed that in over 2000 hours of continuous operation with coal-fired flue gas an average of greater than 90% CO_2 was removed. The energy requirement for H3 was the lowest among the solvents tested and corrosivity was insignificant. The latest refinement of this proprietary solvent, H3-1, has the same advantages as H3 and further reduced amine loss.
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